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    精英家教网 > 高中英语 > 题目详情
    After ________ time, Edison ________ lights and many other things, most of which are considered very important in history.

    A. /; discovered　　  B. a; discovered　　 C. a; invented　　　　 D. /; invented

     

    答案：C
    提示：

    		a time在本句中等于a period of time。

     


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